Pierre-Yves Thoulon wrote:
> METADATA_BLOCK_HEADER has a 24-bit field to encode the length of
> METADATA_BLOCK_DATA ; hence the limitation (which not only applies
> to METADATA_BLOCK_PICTURE but all metadata blocks.
I see. So it's possible to abuse some other metadata blocks too..
I found the following checks in libFLAC and metaflac sources:
src/libFLAC/metadata_iterators.c, write_metadata_block_header_cb_(...):
FLAC__ASSERT(block->length < (1u << FLAC__STREAM_METADATA_LENGTH_LEN));
src/libFLAC/stream_encoder_framing.c, FLAC__add_metadata_block(...):
FLAC__ASSERT(i < (1u << FLAC__STREAM_METADATA_LENGTH_LEN));
src/metaflac/options.c, FLAC__bool parse_add_padding(...):
return *out < (1u << FLAC__STREAM_METADATA_LENGTH_LEN);
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